JPH04105249A - magnetic recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording and reproducing apparatus for recording and reproducing signals on a magnetic tape.

[Conventional technology]

In recent years, there has been a strong demand for miniaturization of magnetic recording and reproducing devices that use magnetic tape, such as video table recorders. Video signals began to be recorded on magnetic tape and signals played back from the magnetic tape, and rotating drum units were also inevitably downsized, making it necessary to wind the tape onto the rotating tram in a small space. Travel routes (hereinafter referred to as tape buses) have also become more complex.

FIG. 5 shows an example of a miniaturized tape bus of, for example, an 8ffffl video tape recorder, and FIG. 6 shows an enlarged view of the vicinity of the tape removal area of the rotary tram unit indicated by 1 in FIG. 5.

In FIG. 5, reference numeral 1 denotes a rotating tram unit having magnetic heads arranged at predetermined intervals around its outer periphery, and consisting of a rotating upper drum and a fixed lower drum.

2 is a capstan that transports the magnetic tape 3 at a predetermined speed; 4 is a pinch roller that pinches and transports the tape together with the capstan; 5 is a supply reel; and 6 is a take-up reel.

The tape bus shown in the figure consists of the rotating drum 1°, capstan 2. It is formed by a pinch roller 4 and kite posts 7 to 15. In particular, the kite post 10.11 forms a movable supply kite post, and the guide post 1
2.13 forms a movable winding side force post. The tape 3 is then pulled out from a cassette (not shown) and wound around the rotary tram unit 1 at a predetermined angle, such as 300 degrees or about 275 degrees.

Further, the guide post 7 functions as a tension regulator for detecting tape tension.

Considering the tape running characteristics in the above configuration, during normal recording and playback, the tape is pulled out from the supply reel 5 with a certain tension, and then supported by each guide post, as shown in the figure. The tape is wound around the rotary tram unit 1 with its position regulated by a tape running path, and then transported by the capstan 2 and pinch rollers 4 and wound onto the take-up reel 6.

At this time, the tension of the tape 3 gradually increases from the supply reel 5 to the capstan 2, which is the drive source for tape running.

Then, when rewinding the tape in the reverse direction, the winding side reel 6
As soon as the tape 3 is pulled out, it is conveyed by the capstan 2 and the pinch roller 4.

After that, rotating tram unit 1. It passes through each kite post and is wound onto the supply reel 5. At this time, since the tape is wound onto the supply reel 5 with a constant torque, the tension of the tape 3 gradually decreases from the supply reel 5 to the capstan 2.

Therefore, the capstan 2 on the rotating tram unit 1
In the vicinity of the tape separation point close to , the tension of the tape 3 varies greatly depending on the running direction.

Therefore, when the tape 3 is running in the normal recording or playback direction, it is stretched linearly with respect to the guide post 12 as shown by the broken line in FIG. As shown by the solid line, as the tension decreases, the rigidity of the tape itself also acts, causing the tape to bulge out from the guide posts 13, 12, etc. and travel in a state separated from it.

This situation becomes conspicuous as the diameter of the rotary tram unit 1 is reduced and the number of corners of the tape is increased as the diameter of the rotary tram unit 1 is reduced.

[Problem to be solved by the invention]

However, in the above-mentioned conventional tape path, when the tape runs backwards, the tape 3 bulges away from the kite post, etc., so the angle of wrapping around the rotating drum unit 1 increases, and the angle between the rotating tram unit 1 and the tape 3 increases. At the separation point of the tape 3, the contact area with the rotating drum unit 1 increases as the tape 3 swells, making the tape running unstable.
Furthermore, there is a risk that an unnecessary load will be applied to the drive system, and in the worst case, the tape 3 will become loose.

Furthermore, the above situation is particularly likely to occur when the surface of the lower drum of the rotating drum unit 1 is worn out due to long-term running of the tape, causing microscopic changes in surface properties. Coupled with the accompanying smoothing of the tape surface, the tape running characteristics become extremely unstable.

The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a magnetic recording and reproducing device that can maintain a stable tape running state for a long time in both tape running directions. be.

[Means to solve the problem]

Therefore, the magnetic recording and reproducing device according to the present invention is a magnetic recording and reproducing device that records and reproduces signals by winding a magnetic tape around a rotating drum unit, and has a hard coating layer made of a titanium compound of columnar particles formed on the surface. The above object is achieved by a structure characterized in that the member is disposed in the travel path of the magnetic tape, and further by a structure characterized in that the columnar particles are made of a titanium compound or titanium carbide. This is what I am trying to do.

(Function) With the above configuration, a magnetic tape is run on a magnetic tape running path on which a member having a hard coating layer made of a titanium compound of columnar particles is formed on the surface, and a rotating tram unit in the running path is magnetically attached. Wrap a tape around it to record and play back signals.

Furthermore, due to the abrasion resistance and moderate stability of the coefficient of friction possessed by the hard coating layer of the titanium compound of the columnar particles, the running performance of the magnetic tape can be stably maintained in both running directions, resulting in excellent recording and reproducing performance.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the magnetic recording/reproducing apparatus based on this invention will be explained by an Example.

The magnetic recording and reproducing device of the present invention records and reproduces signals by winding a magnetic tape around a rotating tram unit, and the outline of the tape bus is either in accordance with the conventional example shown in Fig. 5 or is not particularly limited. Rather, the present invention is characterized by members forming a tape bus, particularly by a rotating drum unit.

FIG. 1 is an external view of a rotary tram unit used in one embodiment of the present invention.

The rotating tram unit 1 consists of a lower drum 101 coated with a titanium compound and a rotating upper tram 102. The upper tram 102 is equipped with a magnetic head 103.
Or installed.

FIG. 2 is an enlarged sectional view showing the tape running surface 104 of the lower drum 101.

The lower tram 101 is made of aluminum,
The tape running surface 104 is covered with a hard coating layer 106 made of a titanium compound formed in the form of particles or columns using ion brane ink on the surface of an aluminum material 105.

FIG. 3 shows data obtained by comparing the state of production of titanium compounds, that is, the difference in effectiveness between columnar and non-columnar compounds, using a test piece to compare the relationship between the number of passes through the tape bath and the coefficient of friction. Furthermore, FIG. 4 shows a comparison between the relationship between the tape tension and the coefficient of friction of the tape against the lower drum 101 after the tape running durability test between the lower drum 104 formed with the titanium compound of the example and the lower drum 104 made of the same material. It is data.

As shown in FIG. 2, a thin film of a titanium compound is formed on the surface of the lower tram 101 using ion plate ink. The film thickness at this time is approximately 0.8 to 1 μM, and the characteristics of the hard coating layer 106 made of the titanium compound are as follows.
As mentioned above, it is generated in the form of particles or columns,
The particle size is also relatively large, approximately 0.2 μM. In the hard coating layer 106 of the titanium compound, the tip of each particle is rounded and smooth, and the particles are densely arranged on the surface. Such a state can be solved by increasing the film formation rate and setting the amount of evaporated titanium particles to be reduced by a predetermined amount, such as titanium carbide (T).
, C), it is not a complete titanium compound such as titanium nitride (TIN), but can be obtained by forming a porous composition such as (T , Xc x+, 1 + 02 ). Moreover, the conditions are different from the conditions commonly used for surface hardening and obtaining a dense, hard film for the purpose of improving wear resistance.

When the tape 3 runs on the surface of the lower drum 101 on which the titanium compound described above is formed, the tape running surface 104,
Since the particles come into contact with the tape 3 at the circular 1/1 portion of the tip thereof, the running load is reduced, and the high abrasion resistance of the titanium compound allows the tape to run smoothly over a long period of time.

As shown in Fig. 3, the particles shown in this example in which a columnar titanium compound is formed have a smaller coefficient of friction than those in which a non-columnar titanium compound is formed. The coefficient of friction is stable with little change.

In addition, as shown in Figure 4, when a titanium compound with columnar particles is formed, compared to when the aluminum material is used as it is, the friction coefficient is stably low even after the tape running durability test, especially when the tape tension The lower tram 101 tends to have a low friction coefficient, especially when rewinding.
This is effective in reducing the running load when the tape tension at the top is low.

In this manner, by subjecting the lower drum 101 to surface treatment to form a titanium compound of columnar particles and forming a hard coating layer, it is possible to realize stable and smooth tape running over a long period of time.

Note that the surface treatment described above does not have to be performed on the entire lower tram 101, but on the vicinity of the tape separation point on the lower tram 101,
That is, it is effective even if it is limited to only the portions near the kitebost indicated by the 51st symbols 11 and 13.

In addition, the formation of a hard coating layer using the titanium compound described above,
It can be applied to the lower tram of a video cheap recorder, or to other members that have a sliding surface with the magnetic tape 3 and form a tape bus, such as a tape kite or kite bin, to improve the running stability of the magnetic tape. The wear resistance of the member can be improved.

〔Effect of the invention〕

As explained above, according to the present invention, a magnetic tape is run on a magnetic tape running path provided with a member having a hard coating layer formed on the surface of a titanium compound of columnar particles,
Signals can be recorded and reproduced by wrapping a magnetic tape around a rotating tram unit on a running route.The magnetic tape is suitable for use due to the abrasion resistance of the hard coating layer of the titanium compound of columnar particles and the stability of the moderate coefficient of friction. It maintains stable running performance over a long period of time in both running directions, and has excellent recording and reproducing performance.

In addition, since the above-mentioned hard coating layer has excellent wear resistance, the thickness of the coating layer can be extremely thin. Therefore, an inexpensive material with good machinability is used as the base material for the parts, especially the lower drum of the rotating tram unit. Providing a magnetic recording and reproducing device that is capable of creating complex shapes and extremely high dimensional accuracy, reducing costs, and offering excellent performance.''4-
You can do that.

[Brief explanation of the drawing]

Fig. 1 is an external view of a rotating tram unit used in an embodiment of the present invention, Fig. 2 is an enlarged sectional view showing the tape running surface of the lower tram of the same rotating tram unit, and Fig. 3 is a tape bus passage. Experimental data on the effect of the titanium compound coating layer shown in the relationship between the number of times and the coefficient of friction (1), Figure 4 shows the experimental data on the effect of the titanium compound coating layer shown in the relationship between the tape tension and the coefficient of friction after the tape running durability test ( 2), FIG. 5 is an explanatory view showing an example of a tape running path, and FIG. 6 is an enlarged view of the vicinity of the tape detachment of the rotary tram unit. 1 is a rotating drum unit, 2 is a capstan, 3 is a magnetic tape, 4 is a pinch roller, 5 is a supply side reel, 6 is a winding side reel, 7 to 15 are guide posts,
1.2.4.7 or 615 to form the tape running path. 101 is a lower tram, 102 is an upper drum, 103 is a magnetic head, 104 is a magnetic tape running surface, 105 is an aluminum material, and 106 is a hard coating layer. Figure 5

Claims (2)

[Claims] (1) A magnetic recording and reproducing device that records and reproduces signals by winding a magnetic tape around a rotating drum unit, in which a member whose surface is coated with a hard coating layer made of a titanium compound of columnar particles is placed in the running path of the magnetic tape. A magnetic recording/reproducing device characterized in that: (2) The magnetic recording/reproducing device according to claim 1, wherein the titanium compound of the columnar particles is titanium carbide.